Thursday, 3 October 2013

Medium Wave tube receiver

Some time ago, one of the members of the Zoetermeer local radioclub, Mans PA2GHJ showed a homemade tube receiver. 

 I think it is good, that in spite of the availability of all type of new components these days like PICs, Si570, Atmel chips and so on, there are still radio fans who use the old valve technology.

 The receiver is a design with one tube (EF80) and  was designed for receiving AM stations in the medium wave broadcast band. The circuit contains a surprise: The anode voltage applied is only 6 Volts DC. In spite of this low supply voltage the receiver is quite sensitive. Under normal circumstances at least 15 stations can be heard through the headphones.
Here some nice pictures including the circuit diagram:
MW radio with battery and headphones, design by PA2GHJ



Side view also showing Amroh 402 coil


Circuit diagram 1 valve receiver

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4 comments:

  1. Paul Stam PAØK4 October 2013 at 00:22

    Hoi Ron, ik heb de indruk dat buizenontvangers gevoeliger zijn. Ik heb zo'n oude buizenontvanger staan voor de middengolf, maar het is geweldig om naar te luisteren. Daar kan mijn transistor radio niet tegen op. 73 Paul

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    Replies
    1. PA2RF4 October 2013 at 01:49

      Hoi Paul,
      Ja oude dingen zijn soms beter.In de tijd van de koude oorlog hadden veel Russische ontvangers een HF buis in de ingangstrap. Hierdoor waren deze ontvangers EMP (Electromagnetic Pulse) –bestending. De ontvangers zouden een nucleaire aanval wel overleven. Hoe het met de operators had afgelopen vermeldt het verhaal niet. 73 Ron

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  2. Anonymous1 November 2013 at 00:49

    Good job and great idea! K-I-S-S principle - "keep it sane and simple". Hope you will keep doing such things! Very interesting! Thank you!

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  3. Anonymous1 November 2013 at 00:50

    PS messerschmit@ua.fm , Alex , 73!

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